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The auxiliary tank heater consists of three separated elements
attached the same way as the main tank.
Functional Description
The heater blankets use 115 vac power, 400 watts maximum
and is controlled by a primary thermostat opening at 75 to 85
degrees F. and closes at 40 to 50 degrees F. A manually reset
backup thermostat opens at 122 to 138 degrees F. and closes at
85 degrees F.
Training Information Point
It is important to prevent ice formation in the water tank
installations. Ice formation in these tanks may cause these
problems:
* Ice expansion damage
* Line blockage preventing normal system operation
* Damage to lavatory and galley heater systems with no
available water
The heater is powered any time the power is applied to the
airplane
If you park the airplane in freezing conditions with no electrical
power, drain the water and toilet systems to prevent ice
formation.
Pull the circuit breakers for the water tank compressor and
water heaters before you drain the potable water system.
ICE AND RAIN PROTECTION - WATER LINES - POTABLE WATER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-71-00
Page 6
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-71-00-004
ICE AND RAIN PROTECTION - WATER LINES - POTABLE WATER - FUNCTIONAL DESCRIPTION
ICE AND RAIN PROTECTION - WATER LINES - POTABLE WATER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-71-00
Page 7
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-71-00-004
Purpose
The gray water anti-icing system prevents ice formation in
these areas:
* The gray water drain lines
* The drain masts.
Gray Water Drain Valve/Lines
Tape heaters warm the gray water drain lines.
The tape heaters use 115v ac power. Circuit breakers control
electric power to the tape heaters. Heat is constant and
automatic when power is on the airplane.
An in-line thermostatic switch controls heat to the drain mast
inlet line.
Drain Masts
The drain masts have integral electric heater elements.
Heat to the mast is constant and automatic when power is on
the airplane.
The drain mast heating elements operate on these two
voltages:
* 115v ac in flight
* 28v ac on the ground.
The drain mast heat uses a reduced voltage on the ground to
prevent a burn hazard to personnel. This also extends the drain
mast service life.
Training Information Point
Do not overlap the wraps of the tape heaters. If the tape is too
long, increase the number of wraps.
ICE AND RAIN PROTECTION - WATER LINES - GRAY WATER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-71-00
Page 8
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-71-00-002
ICE AND RAIN PROTECTION - WATER LINES - GRAY WATER - FUNCTIONAL DESCRIPTION
ICE AND RAIN PROTECTION - WATER LINES - GRAY WATER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-71-00
Page 9
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-71-00-002
Purpose
The vacuum waste anti-icing system prevents freeze-plugging
of the waste system drain and service lines.
General
The system uses resistance type electric heaters in these
areas:
* Vacuum waste tank drain (ball) valve
* Vacuum waste tank rinse line.
Waste Tank Drain (Ball) Valve
A blanket heater warms the waste tank drain (ball) valve.
The blanket heater uses 115v ac. Heat to the valve is automatic
when power is on the airplane.
Waste Tank Rinse Line
A rinse line tape heater warms the waste tank rinse line.
The line heater uses 28v dc. Heat to the rinse line is automatic
when power is on the airplane.
ICE AND RAIN PROTECTION - WATER LINES - VACUUM WASTE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-71-00
Page 10
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-71-00-003
ICE AND RAIN PROTECTION - WATER LINES - VACUUM WASTE - FUNCTIONAL DESCRIPTION
ICE AND RAIN PROTECTION - WATER LINES - VACUUM WASTE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-71-00
Page 11
D633A101-GUN Jun 10/2003
　
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